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Muscles that Move theArm

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Nine musclescross theshoulder joint. Only two of thes

do not originate on the scapula,he

and th

.

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Twoadditional muscles have

headsthat cross the shoulderjointand also cross the elbowjoint, the and

.

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1. trices !rachii

2. !ices !rachii

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"hese two muscleswill !etreated in the ne#t grou. Fourmusclesthe ,

, anfor the

rotator (musclotendinous) cuwhich hels to stabilize theshoulder joint.

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Muscle( Pectoralis major

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Muscle( Pectoralis Major

Origin( )lavicle and sternum

&nsertion( *umerus

Action( +le#ion, adduction andmedially rotation of arm

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Latissimus dorsi

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Muscle( Latissimus dorsi

Origin( $ines of lowerthoracic and all lum!ar

verte!rae, ri!s -12,lum!odorsal fascia

&nsertion( *umerus

Action( Extension,adductionand medially

rotationof the arm

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Deltoid

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Muscle( Deltoid

Origin( )lavicle and scaula

&nsertion( *umerus

Action( A!duction at shoulder,also e#tension, fle#ion,medial and lateral rotation

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$u!scaularis

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Muscle( $u!scaularis

Origin( $caula

&nsertion( *umerus

Action( Medial rotation atshoulder joint

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$urasinatus

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Muscle( $urasinatus

Origin( $caula

&nsertion( *umerus

Action( Medial rotation atshoulder joint

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Muscle( &nfrasinatus

Origin( $caula

&nsertion( *umerus

Action( Lateral rotation atshoulder joint

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"eres major

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Muscle( "eres major

Origin( $caula

&nsertion( *umerus

Action( #tension, adductionand medial rotation atshoulder joint

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Muscle( "eres minor

Origin( $caula

&nsertion( *umerus

Action( Lateral rotation atshoulder joint

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)oraco!rachialis

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Muscle( )oraco!rachialis

Origin( $caula

&nsertion( *umerus

Action( Adduction and fle#ionat shoulder joint

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+le#ion, adduction and mediallyrotation of arm

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Pectoralis major

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)oraco!rachialis

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Lateral rotation at shoulder join

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"eres minor

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#tension, adduction andmedially rotation of the arm

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Latissimus dorsi

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#tension, adduction and mediarotation at shoulder joint

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"eres major

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A!duction at shoulder, alsoe#tension, fle#ion, medial and

lateral rotation

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Deltoid

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Medial rotation at shoulder joint

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$u!scaularis

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A!duction at shoulder joint

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Lateral rotation at shoulder joint

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&nfrasinatus

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Origin(

)lavicle and scaula

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Deltoid

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Origin( $ines of lower thoracicand all lum!ar verte!rae, ri!s-12, lum!odorsal fascia

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Latissimus dorsi

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)lavicle and sternum

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